混凝土梁桥剩余使用寿命研究

发布时间：2018-05-23 17:03

本文选题：混凝土桥 + 梁桥　；参考：《桥梁建设》2014年05期

【摘要】：为揭示混凝土梁桥剩余使用寿命的演化规律,在分析混凝土碳化及钢筋腐蚀过程的基础上,研究钢筋腐蚀对梁桥承载能力的影响,考虑钢筋和混凝土协同工作能力的降低,以混凝土梁桥达到承载能力极限作为剩余使用寿命的终结标准,提出了梁桥剩余使用寿命的预测模型。借助随机过程方法,得到混凝土梁桥中钢筋开始腐蚀、锈胀开裂以及达到承载能力极限时的钢筋腐蚀深度与剩余使用寿命之间的关系,并针对不同的使用环境分别建立了剩余使用寿命的表达式。结果表明,混凝土梁桥在使用10.07~10.97年后钢筋开始腐蚀;当钢筋腐蚀深度为0.047mm时,混凝土开裂,导致钢筋腐蚀速度加快;当钢筋腐蚀深度为1.591~1.595mm时,混凝土梁桥达到承载能力极限。
[Abstract]:In order to reveal the evolution rule of residual service life of concrete beam bridge, based on the analysis of concrete carbonization and corrosion process of steel bar, the influence of steel bar corrosion on the bearing capacity of beam bridge is studied, and the reduction of cooperative working ability of steel bar and concrete is considered. Taking the ultimate bearing capacity of concrete beam bridge as the end standard of residual service life, the prediction model of residual service life of beam bridge is proposed. With the help of stochastic process method, the relationship between the corrosion depth of steel bar and the remaining service life of steel bar in concrete beam bridge is obtained when the steel bar begins to corrode, rust dilate and crack, and the corrosion depth of steel bar reaches the limit of bearing capacity. The expression of the remaining service life is established for different use environments. The results show that the concrete beam bridge begins to corrode after using 10.07 ~ 10.97 years, when the corrosion depth of the steel bar is 0.047mm, the concrete cracking results in the accelerated corrosion speed of the steel bar, and when the corrosion depth of the steel bar is 1.591~1.595mm, the concrete beam bridge reaches the limit of bearing capacity.
【作者单位】：同济大学土木工程防灾国家重点实验室;吉林大学交通学院;
【基金】：973项目子课题(2013CB036305) 教育部高等学校博士学科点专项科研基金项目(20100061110051)~~
【分类号】：U448.33;U441.4

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